MotoGP

In any sand pit, shift into reverse and your tires will turn green after a while. Continue this to turn them blue.

At the main menu, press Left, Up, Left, Left, B, Up, Left, Left, B, Y, Down, Up, B.

Watch the credits, at the end, you'll play a Space Invader shoot-em-up style game. The score you obtain are listed under your GamerTag on the XBL account.

In the MotoGP Xbox Live demo go to the credits section wait till the credits are done and you'll be taken to the Credits Shooter Mini game.

The solution to winning hard seasons is to get the #2 bike by winning the challenges. The way you get the bike is by taking the challenges that have a photo card. If you complete these, you will have won the #2 bike. Although the game gives the impression that the longer the race, the better off you are in the possibility of winning, this is false. All hard arcade races, seasons, etc. should be set to only 2 laps. The races are short, but the racers gear themselves for a 2 lap race, which can be used to your advantage. Before you begin your arcade race or season, set the #2 bike up correctly. Go to "Settings" and use the following values.

Transmission: Set to only 2 notches
Brakes: Set to maximum
Handling: Set to maximum
Acceleration: Set to maximum
Once you have these settings, you will win every arcade race, and will come in first for seasons you have to race. If you place second in a couple of races, you will still win the season. All challenges from here on in become relatively easy.

In the Moto GP: Online demo for XBOX Live, enter the unlock everything code(left, up, left(x2), B, up, left(x2), B, Y, down, up, B on the main menu, and it will bring to this mini game.

In the training section, turn your bike around and go the opposite direction from the starting point. You may go as far as needed so that when you turn back around, you will build enough speed shave seconds off the clock and complete the test within the time requirements.

Sete Gibernau: 200,000 points in Jerez in Arcade
Alex Criville: 200,000 points in Le Mans in Arcade
Norick Abe: 200,000 points in Mugello in Arcade
Carlos Checa: 200,000 points in Assen in Arcade
Shinya Nakano: 200,000 points in Donington in Arcade
Alex Barros: 200,000 points in Sachsenring in Arcade
Loris Capirossi: 200,000 points in Brno in Arcade
Max Biaggi: 200,000 points in Valencia in Arcade
Valentino Rossi: 200,000 points in Philip Island in Arcade
Tohru Ukawa: 200,000 points in Suzuka in Arcade